<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    var message = "Hello World"
    console.log(message.slice(3, 7)) // lo W
    console.log(message.slice(3, -1)) // lo Worl
    console.log(message.slice(3)) // lo World

    console.log(message.substr(3, 7)) // lo Worl
    console.log(message.substr(3)) // lo World

  </script>
</body>

</html>